Just tried RC1.1 and I still got random errors while creating .rdt file.
I attached 2 logs, 1 is for "operating system directive CreateFile failed" error and 2 for "The underlying provider failed on Open." error.
It seems to be random, as I said in a previous post, sometimes I get one of those errors and sometimes it just works...
Dat file used: No-Intro Nintendo - Super Nintendo Entertainment System (20171119-121520).
I'm on Windows 10 (1709), do you need to know something else in particular that could help you?